Compensating device for carburetors of internal combustion motors



Jan, 28, 1941. H. J. KRATZER COMPENSATING DEVICE FOR CARBURETORS OFINTERNAL COMBUSTION MOTORS.

Filed April- 18, 1938 IIIIIIIIIIIL Patented Jan. 28, 1.941 I I I UNITEDSTATES PATENT OFFICE COMPENSATING DEVICE FOR, CARBU- RETORS OF INTERNALCOTMBUSTION MOTORS Herbert J. Kratzer, St. Louis, Mo.

Application April 18, 1938, Serial No. 202,621 10 Claims. (01. 123-124)This invention relates to a compensating deof the two-part housing 4 isan air chamber 8 vice for carburetors of internal combustion mohaving acommunicating inlet branch 9 which tors, which is presently adapted tobe located may lead from an air cleaner or the like. between thecarburetor and the intake manifold The part 10 of the housing 4 issecured beof a motor so as to be effective on the vcarburetted tween thecarburetor 5 and manifold 6, and the mixture as it is entrained from thecarburetor parts 1 and I0 of the housing being secured toto the intakemanifold, and is a furthering of the gether by bolts H, and when thussecured, the invention disclosed in my U. S. Letters Patent C amber l2formed in e p 1 Communicates No. 2,212,101, 'dated August 20, 1940. witha pair of passages l3 in the part I0 which The invention of the instantapplication has m e, w t the arbu e 5 a the 1c for one of its objects toprovide a device having manifold a valve controlled auxiliary chamberactuated Extending u h t e Cha ber I2 s a ve i al by vacuum' controllinmeans governed by th tube M having its upper end disposed above theaccelerator means of an internal combustion housing, the lower e d ofsaid tube communica l5 motor. ing with a horizontal passageway l5, andsaid Another object is to provide a device having a ageway av the Ve aru W with vacuum actuated auxiliary air valve which is Whieh'e D ValveiS cooperable, and e V under the control of another valve operated byticel n i of the passageway l5 u c tthe accelerator rod of thecarburetor of an inmg With the Chamber adjacent the ports i3 ternalcombustion motor, formed in a vertically disposed cylindrical 20 Afurther object is to provide a device in the Sleeve form of a housinghaving therein a chamber Both the pp end of e ve 9 a d he whichcommunicates with both the carburetor tube communicate With the chamber8,

and the intake manifold of an internal combusand the sleeve I9 extendsdownwardly to the 25 tion motor, and the housing having a free air p w y5, n r pr al in said sleeve is a venting passage communicating to thchamber piston or plunger 20 which is normally positioned having aresisting valve t respective ends and a in the sleeve with respect tothe ports 18 thereof, vacuum actuated plunger cooperable with the by acoil Spring H which is Centered Over & lug outlet end of the passage andbeing effected by- 22 which extends upwardly from the bottom 0f 3 airentrainment through said passage. the passageway cooperable W the InletA still further object is to provide a device for of the tllhe i4 is pValve 3 w ch s carcooperation with both the intake manifold and ried bye Sylphen element d e e e tbeing the carburetor of an internalcombustion. motor, edillstabiy red to the b acket 25 and is disforadmitting varying proportions of free air, posed within the air chamber8. 35 comprising an attachable unit having an inlet The up er e te d endo t e pin va ve 11 s passage leading to the manifold, andthe passage p vh a J 26 attached to a hook 21 having cooperable resisting valves, oneof which a d a lever 23 which is pivoted at 9 o a is mechanicallyactuated and the other being bracket 30 secured to the housing the w n4o thermostatically actuated, and a spring return end of d lever beingConnected at to the plu cooperable with the passageway. arm 32. of abell crank lever 33, and connected Other objects and advantages willappear as at 34 to the other end of said bell crank lever is thisdescription progresses and by reference to an accelerator rod 35. thedrawing, in which: I The bell cranklever 33 is securely fixed to aFigure 1 is a sectional plan elevation showing shaft 36 which issupported in the carburetor 5, 45 an adaptation of the invention in acooperable and fi e Said Shaft are the w throttle position with .thecarburetor for an internal com- Valves of the eerbllleteri bustionmotor. As shown, the valve ll being slightly larger in Figure 2 is aside elevation of Fig. 1. capacity than the valve 23, has the greatestvaria- 'Figure 3 is a vertical sectional elevation taken iii-0h Over thethrottle range of motor Operation 50 approximately on the line, 3-3 ofFig. 1. as the valve l1 varies from point .005 to .015 of Referring tothe drawing, 4 designates a hous-' a square inch, the latter sizehowever, being at ing which is secured between the carburetor 5 wideopen throttle, whereas the valve 23 varies and the intake manifold 15 ofan internal comfrom .006 of a square inch at 6,000 feet sea level 5 tionm r. n m n n p f the part 1 and at 120 degrees temperature to .012 of asquare inch at sea. level atmospheric pressure or at zero.

When a motor equipped with this improved compensating device is atidling operation, the parts described are in the approximate positionsshown, in which the valve I I will 'be in its most closed position,whereas the valve 23 which may be in its most open position with respectto the tube M, will allow more air to enter the passageway I 5 than isevacuated by any possible vacuum formed in the housing chamber l2 ormanifold 6. When the accelerator rod 35 is actuated to operate thethrottle valves 31 to wide open throttle positions, the valve II will bein its most open position, and the entrained free air through the tubel4 and passageway l5 will create a pulling force under the piston 20 toapproximately approach the vacuum created in the chamber I 2 of thehousing 4 for the reason that the constant leak or venting of air pastthe valve 23 and through the passageway l5? will not equal the volumetaken by the manifold, past the valve l1.

At points in between positions of idli and full open throttle, thevarying vacuum pressures in the chamber l2 will be extended so as tobecome efiective in the passageway l5 and under the piston 20, andthereby moving the piston downwardly to varying extents created by thevacuum, to open the ports I8 in the cylindrical sleeve l9 against thetension of the coil spring 2|. Obviously, the volume of entrained airthrough the ports I 8 is that amount determined by the vacuum pullcreated in the chamber l2.

Undercold temperatures and sea level pressures, the Sylphon element 24will remain contracted and the resistance of the valve 23 thereof at theinlet end of the tube M will be a minimum; therefore, the pressure underthe piston 20 will likewise be a minimum over the entire throttle actionrange of the motor. With increase of temperature or altitude, theSylphon element 24 will expandand move the valve 23 thereof into acloser position with the inlet end of thetube l4, thereby causing agreater resistance to the flow of air through the passageway l5, andconsequently, the vacuum of the chamber l2 will become more efiective onthe under side of the piston 20 to move the piston a greater degreedownwardly in uncovering or opening the ports l8, even though thethrottle action and the vacuum in chamber l 2 remain the same as whenthe Sylphon element 24 was in its contractedposition.

Specifically, the upper extending end of the tube I4 is provided with anapertured sleeve 38 in which the valve 23 is engaged, said sleeveserving as a guiding element to said valve, and to counteract the springeffect of the Sylphon element 24, a coil spring 39 is engaged at itsupper end against the under side of the element and having its lower endseated on the housing 4, said spring making the Sylphon element moreeffective with regard to changing its length due to temperature andpressure variations.

The lower end of the coil spring 39 is disposed to overlap'the sleeve l9to serve as a stop to prevent the plunger 20 being forced outwardly fromthe sleeve by its spring 2|, and in operation the striking of theplunger 20 against the spring, will vibrate the Sylphonelementsufliciently to free any frictional sticking of the valve 23 withthesleeve 38. l

The ports l8 are preferably-graduated in width for increasing ordecreasing the inlet areas of the chamber l2, as determined by theopened po sitions of the plunger 20 as may be required to govern theexpanding and contracting action of r the Sylphon element 24, andconsequently, greater or lesser air charges will be entrained throughthe passageway l5 as determined by the position of the valve 23, inco-relation however, with the position of the valve I! in respect to theoutlet end of said passageway l5.

While I have described one embodiment of my invention with someparticularity, obviously many other embodiments thereof will occur tothose skilled in the art to which it appertains. I, therefore, do notlimit myself to the precise details described, but claim as my inventionall variations and modifications coming within the scope of thesubl'oined claims.

What I claim is:

1. A compensating device for an internal combustion motor comprising ahousing having a chamber therein, an intake manifold with which saidchamber communicates, a passageway leading to said chamber from theoutside of the housing, a manually controlled valve and athermostatically controlled valve cooperable with said passageway, and aplunger forv governing the admittance of auxiliary air to said chamberand being under the control of suction in said passageway.

2. A compensating device to be inserted between the intake manifold andthe carburetor of an internal combustion motor comprising a housinghaving a chamber in communication with the manifold and the carburetor,a passageway leading to said chamber from the outside of the housing, amanually controlled valve and a thermostaticall controlled valvecooperable with said passageway, a ported cylinder intercepting saidchamber and said passageway, and a plunger in said cylinder eflected byand being under the control of suction in said passageway.

3. A compensating device for an internal combustion motor comprising ahousing having a chamber, an intake manifold with which said chambercommunicates, a passageway leading to said chamber from the outside ofthe housing, a ported cylinder having one end in communication with saidpassageway and its other end communicating with the outside of saidhousing and the ports of said cylinder adapted to communicate with saidchamber, a plunger in saidcylinder cooperable with the ports thereof, amanually controlled valve cooperable with said passageway on one side ofsaid plunger, and a thermostatically controlled valve cooperable withsaid passageway on the other side of said plunger.

4. A compensating device for an internal combustion motor comprising ahousing having a chamber therein, an intake manifold with which saidchamber communicates, a passageway leading to said chamber from theoutside of the housing, a ported cylinder having'one end incommunication with an intermediate portion of said passageway and beingin communication at its other end with the outside of said housing, aplunger in said cylinder cooperable with the ports thereof, and a, pairof controlled valves having cooperable relation'with said passageway.

5. A compensating device for an internal combustion motor comprising ahousing having a chamber, an intake manifold with which said chambercommunicates, a passageway leading to saidchamber from the outside ofthe housing, a thermostatically controlled valve cooperable with saidpassageway, a ported cylinder having one end in communication with saidpassageway and its other end in communication with the outside of thehousing, the ports of said cylinder being in communication with saidchamber, and a plunger in said cylinder.

6. A device for cooperable connection with an intake manifold of aninternal combustion engine for admitting auxiliary air thereto,comprising a housing having a chamber in communication with themanifold, a passageway leading to said chamber from the outside of thehousing and having a thermostatically controlled valve cooperable withsaid passageway, a ported plunger cylinder communicating at one end withsaid passageway and at its other end with the outside of the housing andthe ports of said cylinder being in communication with said chamber, anda plunger mounted in said cylinder and cooperable with said ports.

7. A device for cooperable connection with the intake manifold and thethrottle valved carburetor of an internal combustion engine foradmitting auxiliary air thereto, comprising a housing having a chamberin communication with the manifold, a passageway leading to the chamberfrom the outside of the housing, a ported cylinder communicating at oneend with-said passageway and at its other end with the outside of thehousing and the ports of said cylinder being in communication with saidchamber, a plunger mounted in said cylinder and cooperable with saidports, and a valve cooperable with said passageway and havingsynchronizing connection with the throttle valve of the carburetor.v

8. A device for cooperable connection with the mitting auxiliary airthereto, comprising a housing having a chamber in communication with themanifold, a passageway leading to the chamber from the outside of thehousing, a ported cylinder communicating at one end with said passagewayand at its other end with the outside of the housing and the ports ofsaid cylinder being in communication with said chamber, a plungermounted in said cylinder and cooperable with said ports, a valvecooperable with said passageway and having synchronizing connection withthe throttle valve of the carburetor, and a thermostatically controlledvalve having cooperable re- 1ation with said passageway.

9. A compensating device for an internal combustion motor comprising ahousing having a chamber therein, an intake manifold with which saidchamber communicates, a passageway leading to said chamber from theoutside of the housing, a manually controlled valve and athermostatically controlled valve cooperable with said passageway, aport at the outlet end of said passageway in communication with saidchamber and adapted to supply air thereto, and a plunger cooperable withsaid port and said passageway and adapted to be actuated by varyingpressures existing in said passageway.

10. A compensatin device for an internal combustion motor comprising ahousing having a chamber therein, an intake manifold with which saidchamber communicates, a passageway leading to said chamber from theoutside of the housing, a manually controlled valve and athermostatically controlled valve cooperable with said passageway, aport at the outlet end of said passageway in communication with saidchamber and adapted to supply air thereto, and a spring returned plungercooperable with said port and said passageway and adapted to be actuatedby varying pressures existing in said passageway.

HERBERT J. KRATER.

